Outside casing cutter



Oct. 24, 1933. 3,v A, OWREY ET AL 1,931,929

OUTSIDE CASING CUTTER Filed Aug. 18, 1931 Patented Oct. 24, 1933 vorrrsnDE oAsINe CUTTER George` A.

Lowrey, Pelly, and Walter F. 1 fr Goose Creek, Tex.

iran,

This invention relates to an outside casin cutter.

An object of the invention Visvtoprovide a tool of the characterdescribed"shapedto be-lowered into a well over ka casing ror pipe therein and equipped with inwardly working cutters, cutter operating gearing and means engageable lwith the pipe to be cut wherebysaid gearing and cutters may be operated to hold the cutters in cutting relation with the pipe or casing to be cut.

Another Objectis to .provide means whereby the cutters will be held yieldingly against the work.

Another object is to provide means for controlling and limiting the operation of springsI employed. l

With the above and other objects in View this invention has particular relation to certain novel '20 features of construction, operation and arrangement of parts an example of which isv given in this specification and illustrated in the accompanying drawing, wherein: Y j

Figure 1 shows a vertical sectional View of the upper end of the tool.

Figure 2 shows a vertical sectional view of the lower end thereof. y Y

Figure 3 shows a cross sectional ViewY taken on the line 3 3 of Figure l, and v Figure 4 shows a cross sectional view taken on the line 4-4 of Figure 2. v

Referring now more particularly to the drawing, wherein like numerals of reference desig nate similar partsV in each of the Irlgures the numeral 1 designates a tubular cutter body, the same as shown being formed of two sections. At its lower end the body is inwardly thickened forming the inside shoulder 2, said thickened lower end being flared to form a guide 3.

On the shoulder 2 there is a coil spring4 which surrounds the tubular rack member 5, whose upper end has an external ange 6 which rests on said spring 4. The lower end of the rack member 4 has the external rack teeth 7 which are in mesh with the gears 8 mounted in y said pipe. ring 15 and y'lngers A1E."l will be held stationary by an excessive pressure inwardly against the pipe bearings 17..and pivoted on:the ring 15l are the upstanding, inwardly inclined iingerslfi.Vv

The flange 6 is confined .betweenthe lower end `19 of the upper section of the body and the inside shoulder 2i) of the bodyV beneath and the range of movement of the rackv.member 5 is therebylimited. v Y in operation the tool may be lowered intov a well by thetubular operating string 21 and the body-1 will loe/guided over the Vupper end'of the pipe 22, to be cut by the guide 3.L y When; the tool is lowered to the desired loca-:- tion it may thenbe moved upwardly until the fingers 18 engage vunderneath a collar 23 of the pipe '22 and a further upward pull will place the spring 14 under compressionv and the rack member 5 will be forced downwardly operating through the trains of gearing described to force the cutters 210 inwardly into engagement with the pipe to be cut'. The' tool may now be rotated, throughthe stringV 21 until the cutters sever During the rotation of the tool the reason'of the engagement of the lingers with the collar 23, and the cutters will be held firmly yet yieldingly againstv thev pipe to be cut so that said pipe willbe effectively severedand yet the cutters may'yield so as not to be broken by'takingA too deep a cut. ,l 1

The upward movementA of the body 1 relative to the pipe being cut will be limited by the inside annular shoulder 24 'in the body l, coming into engagement with the race ring 16 abovel so that the cutters i9 will not be subjected to to be cut vand the inward movement of the cutters 10 will be limited by the said annular shoulder 20 which limits the range of downward movelment ofv the rack `member 5.

Whenthe cut has been completed, and the upward pull on the tool released, the spring 4 will elevate the rack member 5 and retract the cutters 10 from engagement with the pipe 22 and the tool' may then be relocated or withdrawn.

The drawingy and description disclose what is now,v considered to be a preferred form of the invention by way of illustration only while the broad principle of the invention will be dened by the appended claims.

What we claimis: i

1. A cutting tool comprising a body shaped to be inserted over a casing in a well, inwardly movable cuttersy mounted in the body, cutter actuating means including a yieldable member, trains of gearing geared to the cutters and to said actu- 110 ating means, said cutter actuating means also including means engageable with the casing and effective to place said yieldable member under compression, upon an upward movement of the tool relative to the casing, whereby the cutters are held in cutting relation with the casing and a yeldable member arranged to retract said. cutters when said compression is released.

2. A cutting tool including a cutter body shaped to be inserted into a well bore over a pipe in said bore to be cut, cutters pivoted in said body and movable inwardly into cutting relation with said tool, a rack member in the body, trains of gearing in operative connection with the rack member and geared to said cutters, a yieldable member associated with said rack member, means associated with said yieldable member and engagable with the pipe to be cut and effective to place said yieldable member under compression upon a longitudinal movement of the body relative to said pipe, whereby the cutters are forced into cutting relation with the pipe, and yieldable means acting against said rack member and normally tending to retract the cutters from cutting relation With'the pipe.

3. A cutting tool including a cutter body shaped to be inserted into a Well bore over a pipe in said bore to be cut, cutters pivoted in said body and movable inwardly into cutting relation with said pipe, a rack member in the body, trains of gearing in operative connection with the rack member and geared to said cutters, a yieldable member adapted to be placed under compression upon a longitudinal movement of the body relative to said pipe, whereby the cutters are forced into cutting relation with the pipe, means for limiting such longitudinal movement of the body relative to said pipe, and a yieldable membei' acting in opposition to the first mentioned yieldable member and normally tending to withdraw said cutters from such cutting relation.

4. An outside cutting tool including a tubular cutter body adapted to be inserted into a Well bore over a pipe in said bore to be cut, cutters pivoted in said body and movable inwardly into cutting relation with the pipe, trains of gears mounted in said body and geared to said cutters, a tubular rack member shaped to surround the pipe to be cut and geared to said trains, a yieldable member in said cutter body supporting said rack member and normally holding said cutters retracted, means for limiting thermovement of said rack member longitudinally of the body, a yieldable member supported on said rack member, means supported on said last mentioned yieldable member and engagable with the pipe to be cut and adapted to place said last mentioned yieldable member and en'gageable with the pipe to longitudinal movement of the body relative to Vsaid. pipe whereby said rack member may be actuated to force said cutters into cutting relation with the pipe;

GEORGE A. LOWREY. WALTER F. HALL.

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